CATALOG OF ORIGINAL DESCRIPTIONS: Acarinina punctocarinata Fleisher 1974

This page provides data from the catalog of type descriptions. The catalog is sorted alphabetically. Use the current identification link to go back to the main database.


Higher levels: pf_cat -> A -> Acarinina -> Acarinina punctocarinata
Other pages this level: << < A. kiewensis, A. mattseensis alticonica, A. mcgowrani, A. microsphaerica, A. multicamerata, A. multiloculata, A. pentacamerata acceleratoria, A. pentacamerata camerata, A. pentacamerata erevanensis, A. planodorsalis, A. praecursoria, A. primitiva, A. proxima, A. pseudosubsphaerica, A. pseudotopilensis, A. punctocarinata, A. quadratoseptata, A. rotundimarginata, A. rugosoaculeata, A. subintermedia, A. subpentacamerata, A. tadjikistanensis, A. triplex, A. umbilicata, A. vedica,

Acarinina punctocarinata

Citation: Acarinina punctocarinata Fleisher 1974
Rank: Species
Type level: The holotype is illustrated on Plate 3, Figures 4, 5, and 6, and is from Hole 220, Core 12, Section 5, 70 72 cm. The age of this sample is early Middle Eocene (P.ll; Globigerinatheka subcon globata subconglobata Zone of Bolli, 1972 = Globigerapsis kugleri Zone of Bolli, 1966).
Holotype Repository: USNM

Linked specimens: USNM-211534 USNM-211532 USNM-211533 USNM-211535

Current identification/main database link: Acarinina punctocarinata Fleisher 1974


Original Description: "The distinctly planoconex test of Acarinina punctocarinata Fleisher is of moderate size for the genus. Chambers are arranged in a low trochospire with four to five in the final whorl. The test outline is typically subquadrate, although small specimens may be rounded. Cameral walls are coarsely perforate but not cancellate. No pore pits with diameters significantly larger than the pore itself, are apparent. Short blunt pseudospines are developed only on the near umbilical shoulders and along the periphery. The dorsal surface is distinctly flattened, but the eary chambers, obscured by thickening of the wall, are slightly elevated. Dorsal intercameral sutures are strongly curved and depressed, particularly between the last few chambers, which are arcuate or lunate in shape. The proximal chamber walls in the final whorl slope downward toward the depressed spiral suture, which forms a broad but distinct groove separating the final whorl from earlier formed chambers. The periphery is slightly lobate and subcute throughout the last whorl. A distinct and thickened pseudocarina composed of a coalsced pseudospines is present along the peripheral margin and may extend a short distance along the dorsal intercameral sutures. This pseudocarina, however, contains large, readily observed, and irregularly distributed pores. The outer ventral chamber walls are steeply inclined from the umbilical shoulders to the periphery; the steepness increases throughout the final whorl. Ventral sutures are straight and depressed. The chambers are broadly wedge-shaped in ventral view and increase markedly in size in the final whorl. The umbilical shoulders are prominent and appear roughened because of the greater development of pseudospines. The umbilicus is relatively narrow, but open and deep. The umbilical to extraumbilical aperture forms a low to moderately open arch at the base of the apertural face and is bordered by a faint rim.

Holotype size: The maximum diameter of the holotype is 0.39 mm; axial elevation is 0.28 mm.

Extra details from original publication: Remarks: This species differs from A. quetra (Bolli) in having more closely appressed and less rounded chambers, a more promi nent development of peripheral thickening, and a distinct groove along the spiral suture. The pseudocarina distinguishes A. punctocarinata from other known early Middle Eocene species. This species is placed in Acarinina, rather than Morozovella, on the basis of overall test form and of the coarsely punctate character of the pseudocarina, which appears to differ fundamentally in nature from the keel observed in typical morozσvellids.

Etymology: The species name refers to this coarsely perforate peripheral thickening, which is distinctive in this form.

References:

Fleisher, R.L., (1974). Cenozoic planktonic foraminifera and biostratigraphy, Arabian Sea, Deep Sea Drilling Project, Leg 23A. Initial Reports of the Deep Sea Drilling Project, 23: 1001-1072.


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Acarinina punctocarinata compiled by the pforams@mikrotax project team viewed: 23-8-2017

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